New reTerminal, powers up with blank screen

TL;DR:
My reTerminal works when I flash the reTerminal factory image. But, sudo apt update && sudo apt upgrade makes the screen non-functional after reboot.

Question:
Has everyone (anyone?) had success using standard Debian updates in the last year with this piece of hardware? I’m using “32bit-20220721T012743Z-001.zip” and “64bit-20220721T012743Z-001.zip” for these tests.

Details:
My reTerminal worked when I first turned it on.

Did sudo apt update && sudo apt upgrade.

Screen was blank on reboot.

Re-flashed image, but used 64-bit version.

Screen didn’t work.

Figured, I’d update the STM32 firmware.

Followed the procedure to determine version.

The firmware corresponded to i2cdetect being “1.7 or later”

Followed upgrade procedure.

Problem: Seems to be the wrong architecture.
Solution: Re-flashed the 32-bit version of the reTerminal factory image.

Screen did not work, but as the STM32 was already in the mode where it’s expected to accept new firmware, I wasn’t worried.

Followed the STM32 upgrade procedurer.

Screen didn’t work after reboot.

Reflashed the 32-bit version of reTerminal stock OS.

Screen worked.

Note, i2cdetect shows the following now. I find this unexpected, but the screen works.

user009@tclab009:~ $ i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:                         -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- UU -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- UU -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- --
40: -- -- -- -- -- UU -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

Installed unattended-upgrade, so I could at least get security patches in case upgrade never works.

Tried sudo apt update && sudo apt upgrade

Screen is blank even before I reboot.

sudo halt

Screen is blank after I start again.